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The effect of whole linseed or xylose treated whole linseed on dairy cow performance and level of the fatty acids C18:3, C20:5 and C22:6 in milk fat

Published online by Cambridge University Press:  27 February 2018

R.J. Mansbridge
Affiliation:
ADAS Bridgets, Martyr Worthy, Winchester, Hampshire SO21 1AP, U.K.
J.S. Blake
Affiliation:
ADAS Bridgets, Martyr Worthy, Winchester, Hampshire SO21 1AP, U.K.
C.A. Collins
Affiliation:
ADAS Bridgets, Martyr Worthy, Winchester, Hampshire SO21 1AP, U.K.
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Abstract

The Committee on Medical Aspects of Food Policy report Nutritional Aspects of Cardiovascular Disease recommended increased dietary intakes of the long chain polyunsaturated fatty acids eicosapentaenoic acid and docosahexaenoic acid to help protect against cardiovascular disease. There is some evidence that a-linolenic acid can be elongated and desaturated by mammalian enzyme systems to produce small amounts of eicosapentaenoic and docosahexaenoic acids. Whole linseeds are rich in a–linolenic acid, and it has been suggested that feeding this oilseed to dairy cows may result in higher levels of the long chain polyunsaturated fatty acids in bovine milk. To examine this hypothesis, the effect of feeding whole ground linseed and xylose treated whole ground linseed on the performance and milk composition of dairy cows was investigated.

Either form of whole linseed reduced dry matter intakes and milk protein concentration. The xylose treated whole linseed increased milk yield, but neither linseed source changed milk fat concentration. Levels of milk a-linolenic acid increased to 1.2 g/100 g fatty acid when whole ground linseed was fed, and to 1.5 g/100 g fatty acid with the xylose treated linseed compared with 0.7 g/100 g fatty acid for cows fed the control diet. The efficiency of incorporation of additional dietary a-linolenic acid into milk fat was estimated to be 1.6 and 3.4% for the whole ground and xylose treated whole ground linseed respectively. Feeding whole ground linseed increased the proportion of a-linolenic acid in milk fat, but there was no evidence of eicosapentaenoic and docosahexaenoic acids in milk fat, suggesting that if any elongation and desaturation of a-linolenic acid occurs in dairy cows, none is transferred to milk.

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Copyright
Copyright © British Society of Animal Science 2000

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References

AFRC 1993. Energy and Protein Requirements of Ruminants. CAB International, Wallingford, Oxford, UK.Google Scholar
Department of Health 1994. Nutritional aspects of cardiovascular disease. Report on Health and Social Subjects No 46. H.M.Stationery Office, London, UK.Google Scholar
H., Hagemeister, D., Precht, D.F., Maike and C.A., Barth 1991. α-Linolenic acid transfer into milk fat and its elongation by cows. Fat Science and Technology 93: 387.Google Scholar
Hebeisen, D.F., Hoeflin, F., Reusch, H.P., Junker, E. and Lauterburg, B.H. 1993. Increased concentrations of omega-3 fatty acids in milk and platelet rich plasma on grass-fed cows. International Journal for Vitamin and Nutrition Research 63: 229233.Google Scholar
Kennelly, J.J. and Khorasani, G.R. 1992. Influence of flaxseed feeding on fatty acid composition of cows’ milk. Proceedings of the 54th Flax Institute of the USA Conference, North Dakota State University, Fargo, ND pp. 99-105.Google Scholar
Mansbridge, R.J. and Blake, J.S. 1997. Nutritional factors affecting the fatty acid composition of bovine milk. British Journal of Nutrition 78: S37S47.Google Scholar
McDonald, I.W. and Scott, T.W. 1977. Foods of ruminant origin with elevated content of polyunsaturated fatty acids. World Review of Nutrition and Dietetics 26: 144207.Google Scholar
Mpelimpasakes, N.G. 1981. Effect of various rations on fatty acid composition of bovine milk fat. Ellenike Kteniatrike 24: 8193.Google Scholar
Scollan, N.D., Fisher, W.J., Davies, D.W.R., Fisher, A.V., Enser, M. and Wood, J.D. 1997. Manipulating the fatty acid composition of muscle in beef cattle. Proceedings of the British Society of Animal Science 1997 pp. 20.Google Scholar
Thomas, P.C. and Chamberlain, D.G. 1984. Manipulation of milk composition to meet market needs. Recent Advances in Animal Nutrition, (ed Haresign, W. and Cole, D.J.A.) pp. 219243. Butterworths, London, UKGoogle Scholar